Abbadon

Abbadon was Azazel's brother. He saw Azazel as taking all that was "his," and fell to spite in that vein.

It came to a head when Azazel married Seir, a woman for whom Abbadon had fostered feelings for decades. Abbadon's jealousy drove him to murder. He sent Azazel and Seir a gift - a book of Dark Elf songs. He set a ward around the house, essentially setting the Etharch's "cameras" on loop, and left, hoping that Azazel would read them and either die or turn.

Seir died instead, but her death no longer translated to grief for Abbadon, but to a twisted joy born of spite. He had hurt Azazel in the deepest way he could have, and that was enough. He fled, cackling, as Azazel's heart hardened to spite as well.

He wanders the fringes between Elven territory and the wasteland, too angry to stay, too tied up in his spite to leave.